Well, going from a physical x16 >> x4 will have some impact at some point. Since you're not using it for gaming it's kind of irrelevant to an extent unless you'll be working with higher than 1080 files that push it.
I'm sure there are reasons why you're still running W7 and this ancient setup though but, it might be time to start considering virtualizing the setup and upgrading to something more efficient overall. I can't even find detailed specs for this MOBO.
There is not a person who's not told me to move on from Windows 7 as I have even been offered a free update to Windows 10.
1.) PC's are not cheap and the Towers have Micro ATX , not ATX with the exception of Omen and Customized PC's. Most PC's now have what they refer to as 'customized towers' which is a miniature version of the ATX.
2.) Most all PC's do not have card readers.
3.) All PC's are doing away with DVD Drives.
4.) A lot of programs such as Windows Movie Maker have disappeared "Top of the Line Editor); why they removed this program is unknown to me. There may be a movement away from video but I cannot state that with certainty.
5.) There are no Dell PC'S with audio out (Line Level) which I need. Only HP offers Line Out.
Naturally, one can add on all of the above, yet the cost is increased.
6.) They're now bringing to the floor the new i9 which requires a cooler pipe to dissipate the heat. I'm not keen on the new technology. This is merely a plan by the manufacturer's to keep the masses continuing to purchase 'new' items. Apple does the same thing with cell phones.. When will people learn that they are being duped continually. Most all of the people are enthralled with phones as the PC's have come to a standstill somewhat.
* Regarding your reply relating to 1080 files: I do a lot of 2000k video from dash cams mainly and Youtube has 1440K content. I really have no problem with my current GT620. Will I have an issue with the GT1030? And, at what point will the GT1080 have an impact? Thanks for your input.
** By the way, I'm ancient.